Apparatus for producing rayon staple fibers from continuous rayon filaments



y 9, 1940- w. RODENACKER ET AL 2,207,383

APPARATUS FOR PRODUCING RAYON STAPLE FIBERS FROM CONTINUOUS RAYON FILAMENTS Filed Dec. 29, 1938 3 Sheets-Sheet 1 In van for: Wolf Rodenacker By file/r Afforneys um? Rag y 9, 1940- w. RODENACKER ET AL 20 3 APPARATUS FOR PRODUCING RAYON STAPLE FIBERS FROM CONTINUOUS RAYON FILAMENTS Filed Dec. 29, 1938 :5 Sheets-Sheet 2 Fig. 4 H 5 fi 5 In ven fors Wo/f Rode/maker B 77 Aff Emil Baumann y 9, 1940- w. R ODENACKER -r AL 2,207,383

APPARATUS FOR PRODUCING RAYON STAPLE FIBERS FROM CONTINUOUS RAYON FILAMENTS Filed Dec. 29, 1938 3 Sheets-Sheet 5 lnvenfors wolf Rodenqcker Patented July 9, 1940 APPARATUS FOR PRODUCING RAYON STAPLE FIBERS FROM CONTINUOUS RAYON FILAMENTS Wolf Rodenacker and Emil Baumann, Wolfen, Germany, assignors to I. G. Farbenindustrie Aktiengesellschalt, Frankfort on the Main,

Germany Application December 29, 1938, Serial No. 248,216

In Germany January 6, 1938 I 3 Claims. This invention relates to an apparatus for producing rayon staple fibers from continuous both the known methods of cutting, an impact cut being made by revolving knives.

A bolt 2 prevented from'rotating by a key 3 is fixed in a base plate I. A pulley 4 driven by a belt or toothed wheel rotates on the fixed bolt 2. One or more shafts 5, each of which carries a circular knife 6 at one end and a toothed wheel -1 at the other, is or are mounted in the pulley l. The toothed wheel 1 engages in the toothed wheel 8 which is fixed to the bolt 2, so that the shaft carryingthe knife is rotated by rotation of the pulley 4, but in a direction opposite be led to an apparatus for combining the fibers into a roving.

-Weclaim:

- 1. Apparatus for producing rayon staple fibers from continuous rayon filaments, said apparatus comprising a core having a plurality of boringstherein extending throughout said core in its longitudinal direction, and constituting guiding channels for bundles of continuous artificial filarayon filaments. thereto. The knife 6 cuts against an edge 9 Continuous bundles of artificial silk filaments which is rotated by friction. The knife may be 5 are usually cut into staple length by a straight a simple circular knife. The filaments are fed 5 bladed knife which cuts the fibers, held in any through one or more borings In or an annular desired manner, perpendicular to their length by duct (I! in Fig. 7). In this case the inner core impact. It has also been proposed to use rel5 of bolt 2, may be supported by interconnectvolving knives, which have the advantage of ing members M (Fig. 7). The bundles 'of fila- 10 facilitating the cutting and of being easily manments (I 3 in Fig. 7) are conveyed by rollers, 10 ufactured and renewed (see for example U. S. belts or their own weight. The uncut bundle Patent No. 1,895,246). of filaments may be assisted in its passage through.

An object of the present invention is the the boring Ill (Figure 1 or conduit I! in Fig. 7) provision of novel means for cutting continuous by air pressure from side channels H in Figures rayon filaments. 2 and 7. 15

An additional object resides in an apparatus In Figure 3, with uniform rotation, the angle a for the production of rayon staple fibers which corresponds with the time during which the guide is simple and reliable in construction and opera- III for the continuous filaments .is covered by tion. the knives and the bundle of filaments stopped go A further object resides in the provision of a in the boring II). This time can be shortened cutting means of the character referred to, which by altering the diameter of the knife or by an is capable of converting a bundle of filaments eccentric drive, for example by elliptical wheels directly into a staple fiber sliveror roving. or' by rotating double crank guides. To obtain Reference is made to the accompanying drawa longer cut the knife disc is disposed towards ings in which the tangential plane of the cutting helix. The 25 Fig. 1 is a diagrammatic view of the apparatus angle of the tangential plane is determined by in vertical section. the speed at which the bundle of fibers is con- Fig. 2 is a diagrammatic longitudinal section veyed, and the speed of rotationlof the disc 4. through one of the leading channels for the end- Figures 4, 5, and 6 and 4a, 5a, and 61; show less filaments. diagrammatically the distribution of the staples to Fig. 3 is a diagrammatical plan view of the .in the resulting sliver if 3, 5 and 7 endless bunpulley and knife with its driving means. dies of filaments are fed to the cutting device. Figures 4, 5, and 6 and 4a, 5a, and 6a show In order to obtain the displacement of staple diagrammatically the introduction of the bunshown in Figure 6, two knives are necessary as dies of filaments and the arrangement of the will'be easily understood. The cut fibers are 35 staple length in the sliver leaving the cutting conveyed away either by free fall or by condevice. veyor belts or rollers which (and herein resides Figure '7 shows a vertical section ofthe core one of the chiefadvantages of the apparatus 2 in an enlarged scale having an annular duct Y shown in the drawings) can be placed within 40 therein instead of a plurality of borings. the usual staple length in proximity of the 40 The cutting apparatus comprises one or more knives. By a helical cut or an alternating cut revolving knives which perform a cyclical, prefin, e. g., 2 or-3 displaced guiding channels In, erably a planetary, motion relatively to the dithe fibers reach the conveyor belt with their rection of motion of the fibers. By this means staple lengths displaced with respect to each is obtained a combination of the advantages of other. The resultant fleece or sliver can then 45 ments, a rotatable disc arranged coaxially on said '5 core, said disc being operatively connected with driving means capable of causing rotation of disc that said cutting implement covers the openings of said guiding channels successively upon rotation, means being provided to impart to said cutting implement a rotation in a direction contrary to the sense of rotation of said rotatable disc.

2. Apparatus for producing rayon staple fibers from continuous rayon filaments, said apparatus comprising a core having an annular duct therein extending throughout said core in its longitudinal direction, and constituting a guiding channel for bundles of continuous artificial filaments, a rotatable disc arranged coaxially on said core, said disc being operatively connected with driving means capable of causing rotation of said disc, at least one shaft rotatably mounted on said disc carying at its end a circular cutting implement, said shaft being so arranged on said disc that said cutting implement covers the opening of said annular of filaments issuing therefrom along a helical line upon rotation, means being provided to impart to said cutting implement a rotation in a direction contrary to the sense of rotation of said rotatable disc.

3. Apparatus for producing rayon staple fibers from continuous rayon filaments, saldapparatus comprising a core having at least one guiding channel therein extending throughout said core in its longitudinal direction, a rotatable disc arranged coaxiallly on said core, said disc being operatively connected with driving means capable of causing rotation oi! said disc, at least one shaft rotatably mounted on said disc carrying at its end a circular cutting implement, said shaft being so arranged on said disc that said cutting implement coveres the opening of said guiding channel upon rotation, means being provided to impart to said cutting implement a rotation in a direction contrary to 'the sense of rotation of said rotatable disc.

WOLF RODENACKER. EMIL BAUMANN.

duct and cuts the bundle 

